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PRINCIPAL ACCOUNTING POLICIES - Other income/ (expense) (Details) (Parenthetical) ¥ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥)
Other income/(expenses) [Line items] |  |  |  |
Gain from the fair value remeasurement upon the discontinuance of the equity method of the investments | ¥ 1,135 | $ 165 |  |
Available-for-sale debt investments impairment charges | 906 |  | ¥ 0 | ¥ 0
Tujia and Tujia Offline | Redeemable Preferred Stock |  |  |  |
Other income/(expenses) [Line items] |  |  |  |
Available-for-sale debt investments impairment charges | ¥ (906) |  |  |

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- Definition Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI https://asc.fasb.org/extlink&oid=124260329&loc=SL6284422-111562 + Details
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